[백준] C++ 1110번 더하기 싸이클

#include <iostream>

using namespace std;

int main() {
	int n;
	int a = 0, b = 0, sum = 0;
	int new_n = 0, count = 0;

	cin >> n;

	if (n < 10) n *= 10;

	new_n = n;

	while (n >= 0 && n <= 99) {

		a = n / 10;
		b = n % 10;
		sum = (a + b) % 10;
		n = b * 10 + sum;
		count++;

		if (n == new_n) break;
		
	}
	cout << count;
}